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Abstract

Electron microprobe analyses are presented of chevkinite-group minerals from Canada, USA, Guatemala, Norway, Scotland, Italy and India. The host rocks are metacarbonates, alkaline and subalkaline granitoids, quartz-bearing pegmatites, carbonatite and an inferred K-rich tuff. The analyses extend slightly the range of compositions in the chevkinite group, e.g. the most MgO-rich phases yet recorded, and we report two further examples where La is the dominant cation in the A site. Patchily- zoned crystals from Virginia and Guatemala contain both perrierite and chevkinite compositions. The new and published analyses are used to review compositional variation in minerals of the perrierite subgroup, which can form in a wide range of host rock compositions and over a substantial pressure- temperature range. The dominant substitutions in the various cation sites and a generalized substitution scheme are described.

Study Area

Additional publication details

Publication type

Article

Publication Subtype

Journal Article

Title

Compositional variation in the chevkinite group: new data from igneous and metamorphic rocks

Series title

Mineralogical Magazine

DOI

10.1180/minmag.2009.073.5.777

Volume

73

Issue

5

Year Published

2009

Language

English

Publisher

The Mineralogical Society

Contributing office(s)

Eastern Energy Resources Science Center

Description

20 p.

First page

777

Last page

796

Country

Canada, Guatemala, India, Italy, Norway, United Kingdom, United States